The MB dealer did the repair and conversation, it was completed according to MB recommended procedures. It does not appear from inspection that the compressor was removed. I know that the system now has PAG oil, and understand that this is not compatible with mineral oil?

It cools fine, I am concerned with the longevity of the compressor. What would you recommend as the correct procedure to return to R12, or since it is now converted, leave it alone.

BD

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87 560 SL
93 300E 2.8
91 300CE-24